<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>语义化标签</title>
</head>
<body>
    <div>这是div标签1</div>
    <div>这是div标签2</div>
    <span>span标签1</span>
    <span>span标签2</span>
    <br>
    <!-- 手机端用的标签 -->
    <header>网页表头</header>
    <nav>网页导航</nav>
    <footer>网页底部</footer>
    <aside>网页侧边栏</aside>
    <section>网页区块</section>
    <article>文章</article>

    这是HTML实体，要学习字      符实体
    <!-- 可以看见敲了好多个空格，但网页只会显示一 -->
    <br>
    这是HTML实体，要学习字&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;符实体


</body>
</html>